Foxboro 2AX-ALM-AR - Dual Alarm Annunciator Module for I/A Series DCS

Foxboro 2AX-ALM-AR – Dual Alarm Annunciator Module for I/A Series DCS

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Product Introduction:
The Foxboro 2AX-ALM-AR is a dual alarm annunciator module designed for the Foxboro I/A Series distributed control system. This module provides a comprehensive alarm management interface directly within the DCS controller, eliminating the need for a separate external alarm annunciator panel. The “2AX” identifies the dual-channel architecture, “ALM” denotes alarm functionality, and “AR” specifies the architecture revision. This module accepts alarm signals from all I/A Series I/O modules and processes them according to configurable priority rules, filtering, and shelving. It drives the operator alarm displays and provides audible alarm output, serving as the central alarm hub for small to medium-sized process control applications.

Technical Specifications:
Board Type: Dual Alarm Annunciator Module
System Compatibility: Foxboro I/A Series DCS (I/AS, I/A Series)
Architecture: Dual redundant processor for alarm processing
Alarm Points: Supports up to 512 alarm points per module
Priority Levels: 8 configurable priority levels (1 through 8, with 1 being highest)
Shelving: Supports alarm shelving with automatic return to unshelved state
Filter Times: Configurable from 0.1 seconds to 60 seconds per alarm point
Display Interface: Drives Foxboro operator stations and dedicated alarm panels
Audio Output: Provides audible alarm tones (continuous, pulsed, or hi-lo)
LED Indicators: Per-alarm LED indicators for local status verification
Communication: I/A Series backplane (UIM/LIM bus)
Power: 5V DC from I/A Series backplane
Form Factor: Eurocard (3U height)
Operating Temperature: 0 to 60 degrees Celsius

Functional Features:
Priority-Based Annunciation: Alarms are displayed in strict priority order, ensuring the most critical alarm always gets operator attention first.
Alarm Shelving: Allows operators to temporarily hide low-priority alarms during abnormal operating conditions (like startup), with automatic return when conditions normalize.
Deadband Filtering: Configurable deadband prevents alarm chatter on analog signals that fluctuate around the setpoint.
First-Out Display: Shows the first alarm that triggered, not the most recent, helping operators identify the root cause.